Video is a Latin word meaning "I see". Today it usually means a film. This is often a short film, perhaps even made by people who don't do this as a profession.
Actually, what you see on television is already a video. The people from television made a film and stored it on a magnetic tape. Later, you could buy such technology for your home. But at first it was quite expensive. Today it has become very cheap and easy to record a video, namely with a smartphone.